“True Blood” stud Alexander Skarsgard was on the hunt for some midnight tequila in the Hamptons over the weekend. The HBO star wobbled up to Water Mill’s Stadium Red Estate asking for “shots of Patron” on Saturday night. Unfortunately, he’d missed the memo that Paul Sevigny’s end-of-summer soiree had begun at 8 p.m. and wrapped up already. But Sevigny and DJ Elle Dee headed with him to Southampton’s South Pointe, where Skarsgard was seen surrounded by adoring women. “Alex took pictures with everyone,” a spy said. “And bought a ton of shots.” The next night, Skarsgard held court at the Surf Lodge on the patio.